Sandwich is located in Dekalb county Illinois with a geographic area of 4.7 square miles. The total population in Sandwich is 7,351 with 50.5% male and 49.5% female. Children under age 5 represent 7.9% of the population, under age 18 equal 26.4% of the population and over age 65 is 16.9% of the population. The median household income is $70,563, per capita income is $29,619. There are a total of 2,548 housing units with 70.4% owner occupied. Education includes 26.0% of residents that are high school graduates and 22.1% with a bachelor's degree or higher. The average temperature in Sandwich in the summer is 70 degrees, and in the winter 27 degrees.
